Influence of crystal structure on the electrochemical performance of A-site-deficient Sr1−sNb0.1Co0.9O3−δ perovskite cathodes
作者： Yinlong Zhu , Ye Lin , Xuan Shen , Jaka Sunarso , Wei Zhou
DOI: 10.1039/C4RA06191H
关键词:
摘要: The creation of A-site cation defects within a perovskite oxide can substantially alter the structure and properties its stoichiometric analogue. In this work, we demonstrate that by vacating 2 5% cations from SrNb0.1Co0.9O3−δ (SNC1.00) perovskites (Sr1−sNb0.1Co0.9O3−δ, s = 0.02 0.05; denoted as SNC0.98 SNC0.95, respectively), Jahn–Teller (JT) distortion with varying extents takes place, leading to formation modified crystal lattice framework. Electrical conductivity, electrochemical performance, chemical compatibility microstructure Sr1−sNb0.1Co0.9O3−δ cathodes for solid fuel cells were evaluated. Among SNC1.00, SNC0.95 (P4/mmm symmetry (#123)) which exhibits large JT in conjunction charge-ordering cobalt (Co) shows best oxygen reduction reaction (ORR) activity at low temperature while (P4mm (#99)), displays local distortion, poorest performance.
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